CN109834356B - Manufacturing method of complex double-alloy cone structure - Google Patents
Manufacturing method of complex double-alloy cone structure Download PDFInfo
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- CN109834356B CN109834356B CN201910175359.5A CN201910175359A CN109834356B CN 109834356 B CN109834356 B CN 109834356B CN 201910175359 A CN201910175359 A CN 201910175359A CN 109834356 B CN109834356 B CN 109834356B
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Abstract
The invention discloses a method for manufacturing a complex double-alloy cone structure, which comprises the following steps: dividing the complex double-alloy cone structure to be processed into three parts according to the design requirement of the complex double-alloy cone structure to be processed for vacuum brazing; the three-part assembly comprises an inner cylinder, a sealing cover plate and an outer shell; the inner wall of the sealing cover plate is longitudinally provided with an inlaid strip, and the inlaid strip is longitudinally provided with a convex strip; coating brazing filler metal on the panel, and performing vacuum brazing after the inner cylinder body and the sealing cover plate are tightly assembled; after the assembly is qualified through the tightness inspection, the sealing cover plate is processed into an arc surface consistent with the arc surface of the outer wall of the inner cylinder; and coating brazing filler metal on the inner wall of the outer shell, tightly attaching the outer shell and the assembly, and then performing vacuum brazing to obtain the complex double-alloy cone structure assembly. The invention adopts split processing, thus reducing the processing difficulty; meanwhile, the inlaid strips and the ribs on the two sides of the cooling channel are lapped to form lap joints, so that the brazing area is increased, and the double-alloy cone structure can bear higher pressure.
Description
Technical Field
The invention belongs to the technical field of aerospace equipment, and relates to a manufacturing method of a complex double-alloy cone structure.
Background
The complex double-alloy cone structure is a high-temperature-resistant sealed cone with a large number of cooling channels and consisting of an inner cylinder body, long and narrow ribs (the width is less than 3mm and the length is more than 350mm) and a sealing cover plate, and is a complex double-alloy structure consisting of an outer layer composite stainless steel pressure-bearing outer shell, wherein the size of the cone is phi 200 and multiplied by 500 mm. The complex double-alloy structure requires absolute sealing between adjacent cooling channels and is used for harsh working conditions such as high temperature, high pressure and the like.
At present, because a complex double-alloy cone structure is an inner-layer double-alloy structure and an outer-layer double-alloy structure, a large number of cooling channels exist, ribs are long and narrow, joints are more, and the absolute sealing between the cooling channels and the thermal deformation of a narrow groove cannot be guaranteed and cannot be controlled by adopting the conventional processes of resistance welding, fusion welding (argon arc welding, laser welding, plasma welding, electron beam welding) and the like, so that the technical requirements cannot be met; certain pressure needs to be applied to the joint parts in the implementation process of diffusion welding, so that great difficulty is brought to the application of pressure to a large number of joint parts, and the technical requirement on absolute sealing is difficult to achieve; when the brazing is carried out in the atmosphere, an anti-oxidation brazing flux needs to be added, so that the influence on a cooling channel is easily caused, and the local high-temperature stress of the assembly is difficult to eliminate to generate cracks; the laser selective 3D printing process cannot realize precise printing of different material parts under the current technical level. The vacuum brazing technology is a feasible method for manufacturing the complex double-alloy cone structure, however, the existing vacuum brazing method mostly adopts an integral brazing process, the integral brazing has high requirements on tools, the fitting degree of a joint part cannot be ensured, and the sealing performance of a device cannot be ensured, so that the pressure resistance of the prepared complex double-alloy cone structure cannot meet the requirements.
Disclosure of Invention
The invention solves the technical problem of providing a manufacturing method of a complex double-alloy cone structure, and the processing difficulty is reduced by adopting a split processing method; meanwhile, the brazing area is increased, and the sealing performance between the cooling channel and the sealing cover plate is enhanced.
The invention is realized by the following technical scheme:
a manufacturing method of a complex double-alloy cone structure comprises the following steps:
(1) dividing the complex double-alloy cone structure to be processed into three parts according to the design requirement of the complex double-alloy cone structure to be processed for vacuum brazing; the three-part assembly comprises an inner cylinder, a sealing cover plate and an outer shell, wherein the inner cylinder and the sealing cover plate are of structures with large two ends and small middle; a plurality of cooling channels are longitudinally formed in the outer wall of the inner cylinder body, a plurality of inlaid strips with the width larger than that of the cooling channels are longitudinally arranged on the inner wall of the sealing cover plate, and protruding strips matched with the width of the cooling channels are arranged on the inlaid strips;
(2) cutting the sealing cover plate at the narrow middle part into an upper valve and a lower valve; uniformly coating brazing filler metal on the inlaid strips of the upper and lower sealing cover plates in an energy storage welding mode, respectively sleeving the upper and lower sealing cover plates outside the inner cylinder body, so that the convex strips extend into the cooling channel, and a certain gap is reserved between the convex strips and the bottom of the cooling channel; adopting a tool to make the panel of the sealing cover plate tightly attached to the ribs at two sides of the cooling channel of the inner cylinder body, wherein the cutting seams of the upper sealing cover plate and the lower sealing cover plate are tightly attached;
(3) tightly assembling the inner cylinder body and the sealing cover plate in the step (2) and then carrying out vacuum brazing in a brazing furnace; after the sealing cover plate is taken out of the furnace, welding the cutting seams of the upper sealing cover plate and the lower sealing cover plate by adopting argon arc welding;
(4) performing tightness test on the cone structures of the inner cylinder body and the sealing cover plate brazed in the step (3);
(5) processing the outer wall of the sealing cover plate into a cambered surface which has uniform thickness and is consistent with the cambered surface of the outer wall of the inner cylinder;
(6) cutting the outer shell into an upper petal and a lower petal along the radial direction; uniformly coating and injecting brazing filler metal on the inner walls of the upper and lower outer shells in an energy storage welding mode, tightly attaching the inner walls of the outer shells and the outer walls of the cone structures of the inner cylinder and the sealing cover plate by using a tool, and performing vacuum brazing in a brazing furnace; and (4) welding the cutting seams of the upper and lower sections of the outer shell by adopting argon arc welding after the steel is discharged from the furnace to obtain the complex double-alloy cone structure assembly.
Furthermore, the wall thickness of the sealing cover plate in the steps (1) to (4) is 1.0-1.5 mm.
Further, in the step (5), the wall thickness of the sealing cover plate is processed to be 0.4-0.6 mm.
Further, the vacuum brazing in the step (3) and the step (6) is carried out under the vacuum condition of 0.01-30 Pa, at the temperature of 350-1095 ℃ and for 8-10 h.
Further, the brazing filler metal is paste brazing filler metal HBNi82 CrSiB.
Further, the gap between the protruding strip and the bottom of the cooling channel in the step (2) is 1-3 cm.
Further, the vacuum brazing specifically comprises the following steps:
(1) vacuumizing the vacuum furnace to make the vacuum degree in the furnace reach 1X 10-2Pa；
(2) Filling high-purity argon into the furnace to ensure that the vacuum degree in the furnace is 50-150 Pa;
(3) heating to 450 deg.C at a rate of 30 deg.C/h, and maintaining for 60 min;
(4) heating to 700 deg.C at a speed of 60 deg.C/h, dividing pressure by 5pa, and keeping the temperature for 60 min;
(5) heating to 900 deg.C at a speed of 90 deg.C/h, dividing pressure to 30pa, and maintaining for 240 min;
(6) heating to 1090 +/-5 ℃ at the speed of 100 ℃/h, carrying out vacuum brazing at the partial pressure of 50pa, and carrying out 4-6 h.
Further, after the brazing is finished, the temperature is controlled and cooled to 700 ℃ at the speed of 90 ℃/h, the pressure dividing valve is closed, the furnace is cooled in vacuum, the temperature is cooled to 200 ℃, and high-purity argon is filled, so that the pressure in the furnace reaches 9 multiplied by 104Pa, and discharging the assembly when the assembly is cooled to 65 ℃.
Further, in step (4), a sealing test was conducted under a pressure of 10.0 MPa.
Further, after the cutting seam is welded in the step (3) and the step (6) by adopting argon arc welding, the welding seam is polished to be smooth.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a manufacturing method of a complex double-alloy cone structure, which adopts split processing to reduce the processing difficulty; set up the panel on sealed apron inner wall, the protruding strip of panel stretches into the cooling channel when sealed apron welds with interior barrel, and the fillet overlap joint of panel and cooling channel both sides forms the overlap joint welding seam, has changed the welding mode of interior barrel and sealed apron butt weld in the past, has increased the area of brazing, has strengthened the leakproofness between cooling channel and the sealed apron, makes the device can bear 10 MPa's high pressure. Meanwhile, the inner wall of the sealing cover plate is provided with the inlaid strip, and the protruding strip extends into the cooling channel during welding, so that the cooling channel can be prevented from being blocked by brazing filler metal, the problem that ribs on two sides of the long and narrow cooling channel are easy to deform in the welding process can be effectively solved, and the adjacent cooling channels are absolutely sealed.
Drawings
FIG. 1 is a schematic structural view of a complex dual alloy cone structure of the present invention;
FIG. 2 is an enlarged view of a portion of the present invention at A;
FIG. 3 is a cross-sectional view taken along line B-B of the present invention at A.
Wherein, 1 is interior barrel, 2 is sealed apron, 3 shell bodies, 4 are cooling channel, 5 are the panel, 6 are protruding strip, 7 are the rib.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
A manufacturing method of a complex double-alloy cone structure comprises the following steps:
(1) dividing the complex double-alloy cone structure to be processed into three parts according to the design requirement of the complex double-alloy cone structure to be processed for vacuum brazing; the three-part assembly comprises an inner cylinder body 1, a sealing cover plate 2 and an outer shell 3, wherein the inner cylinder body 1 and the sealing cover plate 2 are of structures with large two ends and small middle; a plurality of cooling channels 4 are longitudinally arranged on the outer wall of the inner cylinder body 1, a plurality of inlaid strips 5 with the width larger than that of the cooling channels 4 are longitudinally arranged on the inner wall of the sealing cover plate 2, and convex strips 6 matched with the width of the cooling channels 4 are arranged on the inlaid strips 5;
(2) cutting the sealing cover plate 2 at the narrow middle part into an upper valve and a lower valve; uniformly coating brazing filler metal on the inlaid strips 5 of the upper and lower sealing cover plates 2 in an energy storage welding mode, respectively sleeving the upper and lower sealing cover plates 2 outside the inner cylinder body 1, so that the convex strips 6 extend into the cooling channel 4, and a certain gap is reserved between the convex strips 6 and the bottom of the cooling channel 4; the panel 5 of the sealing cover plate 2 is tightly attached to ribs 7 on two sides of a cooling channel 4 of the inner cylinder body 1 by adopting a tool, wherein the cutting seams of the upper sealing cover plate 2 and the lower sealing cover plate 2 are tightly attached;
(3) tightly assembling the inner cylinder 1 and the sealing cover plate 2 in the step (2), and then carrying out vacuum brazing in a brazing furnace; after the sealing cover plate is taken out of the furnace, the cutting seams of the upper sealing cover plate and the lower sealing cover plate 2 are welded by argon arc welding;
(4) performing tightness test on the cone structures of the inner cylinder body 1 and the sealing cover plate 2 brazed in the step (3);
(5) the outer wall of the sealing cover plate 2 is processed into a cambered surface which has uniform thickness and is consistent with the cambered surface of the outer wall of the inner cylinder body 1;
(6) cutting the outer shell 3 into an upper lobe and a lower lobe along the radial direction; uniformly coating brazing filler metal on the inner walls of the upper and lower outer shells 3 in an energy storage welding mode, tightly attaching the inner walls of the outer shells 3 and the outer walls of the cone structures of the inner cylinder body 1 and the sealing cover plate 2 by using a tool, and performing vacuum brazing in a brazing furnace; and (3) welding the cutting seams of the upper and lower outer shells 3 by adopting argon arc welding after the materials are discharged from the furnace to obtain the complex double-alloy cone structure assembly.
Specifically, the inner cylinder 1 is made of chromium zirconium copper, the sealing cover plate 2 is made of T2, and the inlaid strip 5 and the protruding strip 6 are made of the same material as the sealing cover plate 2. Because the inner cylinder body 1 works in a high-temperature environment, the temperature reaches 2300K, and the inner cylinder body 1 needs higher heat conductivity, the chromium-zirconium-copper material is adopted to prepare the inner cylinder body 1. The material of the outer case 3 is 0Cr18Ni9 stainless steel. The inner cylinder body 1 and the sealing cover plate 2 are both of a structure with large two ends and small middle, the sealing cover plate 2 cannot be directly sleeved outside the inner cylinder body 1, the sealing cover plate 2 is cut into an upper valve and a lower valve at a middle narrow part, and the upper valve and the lower valve of the sealing cover plate 2 are sleeved outside the inner cylinder body 1 for vacuum brazing. In order to prevent the copper from melting at high temperature, a plurality of cooling channels 4 are arranged on the outer wall of the inner cylinder body 1, and in the working process of the device, high-pressure water is introduced into the device to cool the inner cylinder body 1, so that the inner cylinder body 1 can normally work at 2300K high temperature.
Specifically, an energy storage electric welding machine is adopted to uniformly coat and inject HBNi82CrSiB paste brazing filler metal on the panel 5 of the sealing cover plate 2, and the inner cylinder body 1 and the sealing cover plate 2 are positioned and clamped by using tooling; specifically, the tool for clamping the inner cylinder 1 and the sealing cover plate 2 is a clamping piece matched with the radian of the outer wall of the sealing cover plate 2, so that the inner cylinder 1 is tightly attached to the sealing cover plate 2, and after clamping, the combined part of the inner cylinder 1 and the sealing cover plate 2 is sent into a vacuum furnace for vacuum brazing.
After an assembly of the inner cylinder body 1 and the sealing cover plate 2 is obtained by brazing, the outer shell 3 is cut into an upper segment and a lower segment along the radial direction; and a runner groove matched with a cone structure formed by brazing the inner cylinder body 1 and the sealing cover plate 2 is longitudinally arranged in the cylindrical stainless steel forging to obtain the outer shell 3. Because the runner groove is of a structure with two large ends and a small middle part, the outer shell 3 cannot be directly sleeved outside a cone structure formed by brazing the inner cylinder body 1 and the sealing cover plate 2, and the outer shell 3 is cut into an upper valve and a lower valve along the narrow part of the runner groove along the radial direction; uniformly coating and injecting paste brazing filler metal HBNi82CrSiB on the inner walls of the upper and lower outer shells 3 by using an energy storage electric welding machine, and tightly attaching the inner walls of the outer shells 3 and the outer walls of the cone structures of the inner cylinder body 1 and the sealing cover plate 2 by using a tool; the tool for positioning and clamping the conical structures of the outer shell 3, the inner cylinder 1 and the sealing cover plate 2 is a clamping piece matched with the appearance structure of the outer shell 3, the outer shell 3 and the assembly of the inner cylinder 1 and the sealing cover plate 2 are tightly attached, and vacuum brazing is carried out in a brazing furnace after clamping; and (3) welding the cutting seams of the upper and lower outer shells 3 by adopting argon arc welding after the materials are discharged from the furnace to obtain the complex double-alloy cone structure assembly.
Furthermore, the wall thickness of the sealing cover plate 2 in the steps (1) to (4) is 1.0-1.5 mm.
Further, in the step (5), the wall thickness of the sealing cover plate 2 is processed to be 0.4-0.6 mm.
In order to ensure the fitting degree of the sealing cover plate 2 and the inner cylinder body 1 and ensure that the sealing cover plate 2 does not deform when the assembly of the sealing cover plate 2 and the inner cylinder body 1 is tightly pressed by a tool, the wall thickness of the sealing cover plate 2 is designed to be larger than the thickness required by design, after the sealing cover plate 2 and the inner cylinder body 1 are subjected to vacuum brazing, the cone structures of the inner cylinder body 1 and the sealing cover plate 2 are subjected to lathe machining to remove the redundant thickness of the sealing cover plate 2, and the wall thickness of the sealing cover plate 2 is 0.4-0.6 mm.
Further, the vacuum brazing in the step (3) and the step (6) is carried out under the vacuum condition of 0.01-30 Pa, at the temperature of 350-1095 ℃ and for 8-10 h.
Further, the brazing filler metal is paste brazing filler metal HBNi82 CrSiB.
Further, the clearance between protruding strip 6 and the bottom of cooling channel 4 in step (2) is 1 ~ 3cm, and in order to guarantee to let in cooling water at the outer wall of inner cylinder 1 and cool off inner cylinder 1, leaves certain clearance between the bottom of protruding strip 6 and cooling channel 4.
Further, the vacuum brazing specifically comprises the following steps:
(1) vacuumizing the vacuum furnace to make the vacuum degree in the furnace reach 1X 10-2Pa；
(2) Filling high-purity argon into the furnace to ensure that the vacuum degree in the furnace is 50-150 Pa;
(3) heating to 450 deg.C at a rate of 30 deg.C/h, and maintaining for 60 min;
(4) heating to 700 deg.C at a speed of 60 deg.C/h, dividing pressure by 5pa, and keeping the temperature for 60 min;
(5) heating to 900 deg.C at a speed of 90 deg.C/h, dividing pressure to 30pa, and maintaining for 240 min;
(6) heating to 1090 +/-5 ℃ at the speed of 100 ℃/h, carrying out vacuum brazing at the partial pressure of 50pa, and carrying out 4-6 h.
Further, after the brazing is finished, the temperature is controlled and cooled to 700 ℃ at the speed of 90 ℃/h, the pressure dividing valve is closed, the furnace vacuum cooling gas is cooled to 200 ℃ along with the furnace vacuum cooling gas, and high-purity argon is filled, so that the pressure in the furnace reaches 9 multiplied by 104Pa, and discharging the assembly when the assembly is cooled to 65 ℃.
Further, in step (4), a sealing test was conducted under a pressure of 10.0 MPa.
After the brazing is finished, the tightness of the assembly of the brazed inner cylinder body 1 and the brazed seal cover plate 2 is tested under the pressure of 10.0MPa, the tightness of the expansion section and the throat section of the assembly of the inner cylinder body 1 and the brazed seal cover plate 2 obtained by vacuum brazing is tested respectively, the pressure is maintained for 2min when the pressure is increased by 1.0MPa to 9.0MPa, the pressure of the expansion section and the throat section of the assembly is tested, no leakage exists in a welding line, and the test is qualified; and maintaining the pressure for 10min under 10.0MPa, and performing pressure test on the expansion section and the throat of the assembly, wherein the welding seam has no leakage and the test is qualified.
Maintaining the pressure at 10.0MPa for 10min, and after the test is qualified, removing the redundant thickness of the sealing cover plate 2, and turning the wall thickness of the sealing cover plate 2 to 0.4-0.6 mm; preferably, the wall thickness of the sealing cover plate 2 is lathed to 0.5 mm; in order to ensure the fitting degree of the inlaid strip 5 of the sealing cover plate 2 and the ribs 7 at two sides of the cooling channel 4 of the inner cylinder 1 during brazing, the wall thickness of the sealing cover plate 2 is set to be 1.0-1.5 mm and is larger than the design requirement; and after the structural tightness of the brazed inner cylinder body 1 and the brazed sealing cover plate 2 is qualified, removing the redundant thickness of the sealing cover plate 2, thereby ensuring that the tightness of the assembly of the inner cylinder body 1 and the sealing cover plate 2 meets the design requirement.
Further, after the cutting seam is welded in the step (3) and the step (6) by adopting argon arc welding, the welding seam is polished to be smooth.
It should be noted that, when the upper and lower two-piece sealing cover plate 2 and the upper and lower two-piece outer shell 3 are welded by argon arc welding, the current is 80-100A, the argon flow is 5-8L/min, and the welding wire material is 0Cr21Ni 10. The conditions of vacuum brazing are the same as those of the vacuum brazing in the step (3), and the details are not repeated. And (4) performing tightness test on the brazed complex double-alloy cone structure under the pressure of 10.0MPa, wherein the method is the same as the tightness test method in the step (4), and is not repeated herein.
By the technical scheme, the invention provides the manufacturing method of the complex double-alloy cone structure, and split machining is adopted, so that the machining difficulty is reduced; set up panel 5 on 2 inner walls of sealed apron, the protruding strip 6 of panel 5 stretches into cooling channel 4 when sealed apron 2 welds with interior barrel 1, the overlap joint welding seam is formed in the 7 overlap joints of rib of panel 5 and cooling channel 4 both sides, the welding mode of butt weld in the past of barrel 1 and sealed apron 2 has been changed in interior barrel, the area of brazing has been increased, the leakproofness between cooling channel 4 and sealed apron 2 has been strengthened, make the device can bear 10 MPa's high pressure. Meanwhile, the inner wall of the sealing cover plate 2 is provided with the inlaid strip 5, and the protruding strip 6 extends into the cooling channel 4 during welding, so that the cooling channel 4 can be prevented from being blocked by brazing filler metal, the problem that ribs 7 on two sides of the long and narrow cooling channel 4 are easy to deform during welding can be effectively solved, and the adjacent cooling channels 4 are absolutely sealed.
The embodiments given above are preferable examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical characteristics of the technical scheme of the invention by a person skilled in the art belong to the protection scope of the invention.
Claims (10)
1. The manufacturing method of the complex double-alloy cone structure is characterized by comprising the following steps of:
(1) dividing the complex double-alloy cone structure to be processed into three parts according to the design requirement of the complex double-alloy cone structure to be processed for vacuum brazing; the three-part assembly comprises an inner cylinder, a sealing cover plate and an outer shell, wherein the inner cylinder and the sealing cover plate are of structures with large two ends and small middle; a plurality of cooling channels are longitudinally formed in the outer wall of the inner cylinder body, a plurality of inlaid strips with the width larger than that of the cooling channels are longitudinally arranged on the inner wall of the sealing cover plate, and protruding strips matched with the width of the cooling channels are arranged on the inlaid strips;
(2) cutting the sealing cover plate at the narrow middle part into an upper valve and a lower valve; uniformly coating brazing filler metal on the inlaid strips of the upper and lower sealing cover plates in an energy storage welding mode, respectively sleeving the upper and lower sealing cover plates outside the inner cylinder body, so that the convex strips extend into the cooling channel, and a certain gap is reserved between the convex strips and the bottom of the cooling channel; adopting a tool to make the panel of the sealing cover plate tightly attached to the ribs at two sides of the cooling channel of the inner cylinder body, wherein the cutting seams of the upper sealing cover plate and the lower sealing cover plate are tightly attached;
(3) tightly assembling the inner cylinder body and the sealing cover plate in the step (2) and then carrying out vacuum brazing in a brazing furnace; after the sealing cover plate is taken out of the furnace, welding the cutting seams of the upper sealing cover plate and the lower sealing cover plate by adopting argon arc welding;
(4) performing tightness test on the cone structures of the inner cylinder body and the sealing cover plate brazed in the step (3);
(5) processing the outer wall of the sealing cover plate into a cambered surface which has uniform thickness and is consistent with the cambered surface of the outer wall of the inner cylinder;
(6) cutting the outer shell into an upper petal and a lower petal along the radial direction; uniformly coating and injecting brazing filler metal on the inner walls of the upper and lower outer shells in an energy storage welding mode, tightly attaching the inner walls of the outer shells and the outer walls of the cone structures of the inner cylinder and the sealing cover plate by using a tool, and performing vacuum brazing in a brazing furnace; and (4) welding the cutting seams of the upper and lower sections of the outer shell by adopting argon arc welding after the steel is discharged from the furnace to obtain the complex double-alloy cone structure assembly.
2. The method for manufacturing the complex dual alloy cone structure according to claim 1, wherein the wall thickness of the sealing cover plate in the steps (1) to (4) is 1.0-1.5 mm.
3. The method for manufacturing the complex dual alloy cone structure according to claim 2, wherein the wall thickness of the sealing cover plate is processed to 0.4-0.6 mm in the step (5).
4. The method for manufacturing the complex double-alloy cone structure according to claim 1, wherein the vacuum brazing in the step (3) and the step (6) is performed under the vacuum condition of 0.01-30 Pa, the temperature of 350-1095 ℃ and the time of 8-10 h.
5. The method for manufacturing a complex dual alloy cone structure according to claim 1, wherein the brazing filler metal is paste brazing filler metal HBNi82 CrSiB.
6. The method for manufacturing a complex dual alloy cone structure according to claim 1, wherein the gap between the protruding strip and the bottom of the cooling channel in step (2) is 1-3 cm.
7. The method for manufacturing a complex dual alloy cone structure according to claim 1, wherein the vacuum brazing specifically comprises the steps of:
(1) vacuumizing the vacuum furnace to make the vacuum degree in the furnace reach 1X 10-2Pa；
(2) Filling high-purity argon into the furnace to ensure that the vacuum degree in the furnace is 50-150 Pa;
(3) heating to 450 deg.C at a rate of 30 deg.C/h, and maintaining for 60 min;
(4) heating to 700 deg.C at a speed of 60 deg.C/h, dividing pressure by 5pa, and keeping the temperature for 60 min;
(5) heating to 900 deg.C at a speed of 90 deg.C/h, dividing pressure to 30pa, and maintaining for 240 min;
(6) heating to 1090 +/-5 ℃ at the speed of 100 ℃/h, carrying out vacuum brazing at the partial pressure of 50pa, and carrying out 4-6 h.
8. The method of claim 7, wherein the brazing process is completed, the temperature is controlled at 90 ℃/h to 700 ℃, the pressure dividing valve is closed, the furnace is vacuum cooled, the temperature is cooled to 200 ℃, and the high purity argon is filled to make the pressure in the furnace reach 9 x 104Pa, and discharging the assembly when the assembly is cooled to 65 ℃.
9. The method of fabricating a complex dual alloy cone structure according to claim 1, wherein the step (4) is performed at a pressure of 10.0MPa for leak tightness.
10. The method for manufacturing a complex dual alloy cone structure according to claim 1, wherein the step (3) and the step (6) are performed by welding the cutting seam by argon arc welding, and then polishing the welding seam smoothly.
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| CN111015091B (en) * | 2019-11-26 | 2022-03-11 | 西安远航真空钎焊技术有限公司 | Welding method of covered spray pipe |
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| CN112247303A (en) * | 2020-09-27 | 2021-01-22 | 西安远航真空钎焊技术有限公司 | Machining method for positioning and assembling bent pipe |
| CN112191967B (en) * | 2020-09-29 | 2022-04-12 | 中国航发动力股份有限公司 | Electron beam brazing repair method for local defects of vacuum brazing part |
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| CN113787307B (en) * | 2021-09-09 | 2022-07-26 | 西安远航真空钎焊技术有限公司 | Machining method for workpiece of pipe expanding and contracting section |
| CN114734106B (en) * | 2022-03-30 | 2024-06-04 | 西安航天发动机有限公司 | Brazing method of copper steel brazing piece with small holes and throat on inner wall |
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| CN102179587B (en) * | 2011-04-27 | 2012-12-19 | 西安远航真空钎焊技术有限公司 | Brazing alloy prefilling process in vacuum brazing |
| CN102950351B (en) * | 2012-11-02 | 2015-10-28 | 首都航天机械公司 | Hydrogen peroxide thrust chamber body portion diffusion brazing manufacture method |
| CN107339227B (en) * | 2017-07-10 | 2020-12-08 | 海门亿峰机械零部件制造有限公司 | Air conditioner compressor exhaust pipe joint assembly and manufacturing method thereof |
| CN108123344A (en) * | 2017-12-29 | 2018-06-05 | 扬州华昌汽车电器有限公司 | Carbon commutator and its manufacturing method |
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